Coal atomizer



J. B. PERKINS GOAL ATouIzER June 17 1924.

Filed Oct. a, 1923 2 sneezs-sh'eez 1 wm mw I a Qlfbo'z "e11 June 17 T924.

- 1,497,792 'J. B. PERKINS I COAL ATOMIZER Filed Oct. a, 1923 2 Sheets-Sheet 2 gwuantoz (Z29. 7%7iz/7p Patented June 17, 1924.

PATENT OFFICE.

JACOB B. PERKINS, 0F FRANKLIN, ILLINOIS.

COAL ATOMIZEB.

application flled October 8, 1923. Serial No. 867,294.

To all whom it may concern-.-

Be it known that I, JACOB B. PERKINS, a citizen of the United States residing at Franklin in the county of Morgan and State of lIllinois, have invented certain new and useful Improvements in Coal Atomizers, of which the following is a specification, reference being had to the accompanying drawings.

his invention relates to improvements in coal atomizers and has for an important object thereof the provision of a device for prolducing finely pulverized or atomized coa An important object of. the invention is to provide a device of this character which is simple inits construction and operation and in which means are provided for pneumatically removing the atomized coal.

A further object of the invention is to provide in a device of this character a novel and improved screenin ing reduction of the delivered coal to a predetermined size, all coal above this size being returned to the machine for further pulverization.

A still further object of the invention is toprovide a device of this character in which the arts are ready of access and which ma e readily cleansed in event of clo ging t ereof.

hese and other objects I attain by the construction shown in the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein Figure 1 is a side elevation partially in section of coal ato-mizing apparatus constructed in accordance with my invention;

Figure 2 is a rear end elevation of the drum;

Figure 3 is a fragmentary perspective of the rotary element within the drum;

Figure 4: is a section on the line r -4 of Figure 1;

Figure 5 is a section on the line 5-5 of Figure 1;

Figure 6 is a section on the line 66 of Figure 5; and

Figure 7 is an enlarged sectional view on the line 77 of Figure 2.

Referring now more particularly to the drawings, the numeral 10 designates a drum or cylinder, having front and back ends 11 and 12, which is provided with hinged doors 13 affording access to the interior device for insur-' thereof. The drum is referably mounted 'upon a solid base 14 and is provided at diametrically opposed points upon its periphery with flanges 15 by means of which it may be secured to the base.

. Disposed within the drum is a shaft 16 which is coaxial with the drum and has its end portions rotatably mounted in bearings 17 formed in the ends 11 and 12. Adjacent its ends interiorly of the drum the shaft has secured thereto 5 iders 18 each consisting of a central or hu portion from which extend outwardly arcuately curved arms 19, all of the arms 19 being curved in the same direction and as will appear from an inspection of Figure, 4, in which the arrow indicates the direction of rotation, curved against such direction of rotation. Pivoted to the free ends of the arms 19 to swing in the plane of rotation of the arms are roller mounts 20 in which are rotatably mounted the pivots of rollers 21 which rollers are preferably constructed of hard steel. To the arms 19 upon the outer surface thereof or that surface which during the rotation of the spiders 18 opposes the interior surface of the drum is secured an angle iron 22, one flange of which is rigidly secured to the arm and the other flange of which is directed radially toward the wall of the drum. It will be noted that the curvature of the arms permits the rollers 21 to be dragged after the arms where they will exercise less tendency when encountering obstructions to place a breaking strain upon the arms and at the same time the curvature of the arms provide a convenient seat for the scraper flange produced by the radially directed flange of the angle iron 22. These scraper flanges will have their outer edge portions spaced from the inner wall of the drum a short distance so that they will at all times leave upon the wall of the drum a thin coating 0 coal to be acted upon by the rollers 21. There is further mounted upon the shaft 16 midway its ends and preferably slightly nearer the rear end 12 a disk 23, the purpose of which will presently appear. end of the shaft 16 has secured thereto means, indicated in the present instance as a pulley 24, whereby power may be applied to rotate the shaft.

In the front end wall an opening is formed with which communicates an inclined chute 25 leading from a hopper 26 One in which may be placed the coal to be reduced. The lower end of the hopper is Weferably provided with an agitator 27.

ith the chute 25 adjacent the point of its communication with the drum a conduit 28 is in communication, this conduit leading from a blower 29, the blower 29 and a tator 27 bein operated from any suitable and prefera ly from the same source. Coal placed in the hopper 26 will be agitated and delivered mto the conduit 25 where it will be gathered u by the blast from the blower 29 and blbwn into the drum 10. The disk 23 acts as a baflle within the drum checking the rush of air and flausing the coal carried thereby to be ro it vii be acted upon by the rollers 21 and scra rs 22.

With the rear or outlet end 12 at the top thereof, a discharge conduit 30 is in communication. This conduit has arranged therein at spaced intervals a plurality of screening devices 31, 32fand 33 which are graduated as to their screening qualities, the. screen 31 next ad'acent the drum being the coarser, the next in finer and the screen 33 bein the finest. e discharge end of the conduit is provided with an elongated discharge screen 34 having the same screening characteristics as the screen 33. The screens 31, 32 and 33 are exactl similar in construction with the exception of the screening qualities thereof. Each of these screens consists of an annular tube 35 in communication with cross tubes 36, the annular and cross tubes being rovided with openings 37 for delivering a last of air in the plane in which they are arranged. To these tubes are secured the screening material, the openings serving to deliver air against this screening material to remove therefrom any coals too large to pass through the screen. Each annular tube 35 is in communication with a source of com pressed air 38 through a conduit 39 ex tending through the wall of the conduit 30, the conduit 39 having arranged therein a valve 40 and being arranged so that it may be rotated to vary the angle of the screening device within the pipe after the manner of a, dam r. These screening devices will normally e arran edso that they entirely obstruct passage 0 all except certain sizes of material. In order to insure sealing about the edges of the screening element a gasket 41 is preferably arranged in the conduit 30 for this purpose.

Paralleling the conduit 30 which inclines upwardly from the point of its engagement with the rear end 12 of the drum is a return conduit 42, which conduit 42 is connected with the conduit 30 by a branch pi e 43 entering the conduit 30 adjacent ear: of the screening devices 31, 32 and 33 and at that d to the bottom of the drum where 1 to be pulverized is placed in the hopper and fed into the drum 10in the manner de- 7 scribed, within the drum 10 it is spread in a thin layer by the scrapers 22 and is crushed between rollers 21 and the inner surface of the i drum 10. It is pointed out that the mountings of these rollers being pivoted to the arms 19 will ermit these rollers to move outwardly un er centrifu al force so that a crushing action will be given by the rollers which is proportional to their speed. The device is preferably operated at a high speed and at such speed these rollers Wlll exert great crushing force and furthermore the scraper flanges will tend to throw the coal about to disturb the interior of the drum so that in the air within the drum will at all times be suspended very finely powdered coal. This air is forced by the blast from the blower 29 through the discharge pipe 30 where the coal is screened and finally delivered through the screen 34. Particles which aretoo large will be checked by the screening devices 31, 32 and 33 and returned to the drum for further pulverization. In event of any of the screens becoming clogged they may be cleaned by operating the valve 40 associated therewith to blow the coal from the screen. In event this proves ingoing it will be seen that by the use of a device constructed in accordance with my invention continuous operation of pu1veriza-- tion can be carried on and the delivery of but a sin le grade of pulverized material guarantee It will furthermore be obvious that the structure hereinbefore set forth is capable of a considerable range of change and modification without in any manner departing from the spirit of my invention and I accordingly do not limit myself to such 5 ecficstructure except as hereinafter c aimed.

I claim 1. Ascreening device for material pulverizers having pneumatic means for discharging pulverized material from the pulverizer including an upwardly inclining conduit, screens arranged within said conduit, means for delivering a blast of air to said screens to remove collected material therefrom, a second conduit substantially paralleling the first named conduit, a connection between said conduits adjacent each of said screens and at that side thereof next adjacent the pulverizing apparatus, the last named conduit communicating at its lower end with said pulverizing apparatus.

2. A screening device for material pul- 'verizers having pneumatic means for conduit, screens arranged within said conduit, means for delivering a blast of air to said screens to remove collected material therefrom, a I second conduit substantially paralleling the first named conduit, a connection between said conduits ad'acent each of said screens and at that side t ereof next adjacent the pulverizing apparatus, the last named conduit communicating at its lower end with said pulverizing apparatus and being provided at the point of communication with a'valve opening toward the pulverizing apparatus.

3. A screening device for material pulverizers having pneumatic means for discharging pulverized material from the pulverizer including an upwardly inclining conduit, screens arranged within said conduit, means for delivering a blast of air to said screens to remove collected material therefrom, a second conduit substantially paralleling the first named conduit, a connection between said conduits adjacent each dis-,- charging pulverized material from thepul -verizer including an upwardly inclining named conduit communicating at its lower end with said pulverizing apparatus, each of said screens being rotatable within the conduit, the discharge end of the conduit in which said screens are arranged being provided with a further screening device.

4. In a screeni device for the purpose described, a conduit, a plurality of screenin devices within said conduit, each comprising a hollow annular -pipe with diametrically hollow branches oonnecting or extending thereacross and a screen secured to said annular pipe, said annular pipe and said branches having 0 enings formed therein directed toward said screen, and a pipe extending through the conduit and communicating with the annular pipe having a valve therein and in communication with a source of air under pressure.

5. In a screening device for the purpose described, a conduit, a plurality of screening devices within said conduit, each comprising a hollow annular pipe with diametrically hollow branches connecting or extending therea'cross and a screen secured to said annular pipe, said annular branches having openings ormed therein directed toward said screen, and a pipe extending through the conduit and communicating with the annular pipe having a valve therein and in communication with a source,

of air under pressure, the last named pipe said annular pipe and screen carried thereby. In testimony whereof I hereunto aflix my signature. I

JACOB B. PERKINS.

ipe and said 

